EXHIBIT 10.6

[LOGO OF SANWA BANK APPEARS HERE]

                   AMENDMENT OF COMMERCIAL CREDIT AGREEMENT


This Amendment of Commercial Credit Agreement ("Amendment") is made and entered 
into this 26th day of June, 1997 by and between SANWA BANK CALIFORNIA (the 
"Bank") and ATG INC. (the "Borrower") with respect to the following:

This Amendment shall be deemed to be a part of and subject to that certain
commercial credit agreement between the parties hereto and dated as of April 19,
1996, as it may have been or be amended from time to time, and any and all
addenda, riders, exhibits and schedules thereto (collectively, the "Agreement").
Unless otherwise defined herein, all terms used in this Amendment shall have the
same meanings as in the Agreement. To the extent that any of the terms or
provisions of this Amendment conflict with those contained in this Agreement,
the terms and provisions contained herein shall control.

WHEREAS, the Borrower and the Bank mutually desire to extend, amend and/or 
modify the Agreement.

NOW THEREFORE, the value required and hereby acknowledged, the Borrower and the 
Bank agrees as follows:

1.   Revised Repayment of Principal. The date contained in section 2.02 D of the
Agreement, which is currently May 30, 1997, shall be modified and amended to be 
August 31, 1997.

2.   Revised Expiration of the Accounts Receivable Line of Credit Facility. The 
date contained in section 2.02 H of the Agreement, which is currently May 
30, 1997, shall be modified and amended to be August 31, 1997.

3.   Incorporation Into Agreement. On and after the effective date of this 
Amendment, each reference in the Agreement to "this Agreement", "hereunder", 
"hereof, "herein" or words of like import referring to the Agreement shall mean
and be referenced to the Agreement as amended by this Amendment.

4.   No Waiver. The execution, delivery and performance of this Amendment shall 
not, except as expressly provided herein, constitute a waiver of any provision 
of, or operate as a waiver of any right, power or remedy of the Bank, under the 
Agreement.

5.   Confirmation of Other Terms and Conditions. Except as specifically provided
in this Amendment, all other terms, conditions and covenants of the Agreement 
which are unaffected by this Amendment shall remain unchanged and shall continue
in full force and effect and the Borrower hereby covenants and agrees to perform
and observe all terms, covenants and agreements provided for in the Agreement, 
as hereby amended.

IN WITNESS WHEREOF, this Amendment has been executed by the parties hereto as of
the date first hereinabove written.

BANK:                                   BORROWER:

SANWA BANK OF CALIFORNIA                ATG INC

By: [SIGNATURE ILLEGIBLE]               By: /s/ Doreen Chiu
   ---------------------------             --------------------------
     Authorized Officer                    Doreen Chiu, President

   Craig C. Fendel V.P. & Mgr.          
   
   /s/ Craig C. Fendel